8 – 10 HEIDENHAIN Technical Manual TNC 426, TNC 430
Signal levels The levels of the individual signal lines differ:
n Data lines: The data signals are defined as being logical zero (SPACE) over
the range +3 V to +15 V and logical one (MARK) over the range –3 V to –15 V.
n Control and verification lines: These signals are defined as being ON (High)
over the range +3 V to +15 V and as OFF (Low) over the range –3 V to –15 V.
Note
For all signals: The voltage range from –3 V to +3 V cannot be evaluated.
+ 15
+ 3
3
15
0
LOW
OFF
"1"
MARK
HIGH
ON
"0"
SPACE
U [V]
Data signals Control and verification
signal
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